JPS6255142A - Multicolor printing machine for cylindrical container - Google Patents

Abstract

PURPOSE:To enable a relative rotational error between a cylindrical container and a transfer roller to be reduced to an extremely small value, by providing a mandrel rotary shaft and a transfer roller rotary shaft with synchronous gears which are engaged to each other at least in a transferring section. CONSTITUTION:Separately form a rotation driving means B, a mandrel-side synchronous gear 27 and a transfer roller side synchronous gear 28 which are engaged to each other at least in a transferring section are provided respectively on the mandrel rotary shaft 13 and the transfer roller rotary shaft 26. With this arrangement, each mandrel 11 is constantly restricted in rotation in the transferring section by the gear 28, and the rotating conditions of the mandrels 11 in the transferring section are quite the same except for machining errors in the gear 27. Accordingly, when the machining accuracy of the gear 27 is raised and made uniform, misregistration of printing elements can be made extremely small.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to multicolor overprinting (multicolor printing without overlapping ink) on the outer peripheral surface of a cylindrical container made of metal or plastic and formed into a tube shape. The present invention relates to a multicolor printing device for performing a multicolor printing device (including a multicolor printing device), and in particular to an improvement technique for a rotational drive system of a multicolor printing device.

(Prior Art) As a prior art multicolor printing method for cylindrical containers, the present applicant proposed a method as described in Japanese Patent Application Laid-open No. 72958/1983.

In multicolor printing, this prior art uses one transfer roller to transfer two or more colors of ink so that overprinted ink lines (halftone dots and fine lines) do not shift in position, and also This method also attempted to forcibly rotate the cylindrical container side.

In other words, by transferring two or more colors of ink with a single transfer roller, it is possible to prevent relative shifts in the ink transfer positions of each color, and by forcibly rotating the cylindrical container side during transfer. , which attempts to prevent slippage due to collision at the start of contact, which occurs when a cylindrical container is rotated in contact using the rotation of a transfer roller.

(Problem to be Solved by the Invention) However, in the above-mentioned prior art, there is a relative rotation error between the rotation of the cylindrical container that is the printing medium and the rotation of the transfer roller that transfers the ink during printing. If this occurs, the error will cause line misalignment, so it is necessary to keep the relative rotation error between the two to a minimum in order to achieve the goal of preventing line misalignment in multicolor printing. It was impossible.

In other words, even if a gear drive device is used as a rotational drive system, and each gear is made of highly accurate gears, it is impossible to manufacture gears with zero tolerance, and backlash when gears mesh is impossible. Even if it is brought close to zero, a certain amount of image line deviation is inevitable in a combination of gears meshing at arbitrary positions with some machining error.

Incidentally, the printing process in multicolor printing will be described between a cylindrical container and a transfer roller using two-color printing as an example.

First, the first color ink is transferred to the first rotation of the first cylindrical container, and the second color ink is transferred to the second rotation of the same cylindrical container.

Note that when the second color ink is transferred, since the first color transfer ink is not yet dry, the first color ink is reversely transferred to the transfer roller side.

Next, when the second cylindrical container is rotated and transferred, the first color ink is transferred in the first rotation, and the second color is transferred as described above.
The second color ink is transferred to the rotating stitches.

However, if a relative rotational error occurs due to an arbitrary gear meshing error during ink transfer, the reversely transferred ink will be transferred to the second cylindrical container with a deviation corresponding to the error.

Therefore, if printing is repeated in the process described above, the reverse transfer position and the position where the reverse transfer ink is transferred will shift sequentially, and the width of the shift will gradually become larger.
It was not possible to overprint precise designs at high speed.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and in order to achieve this purpose, the present invention uses a plurality of cylindrical containers that support one cylindrical container. a mandrel cylinder provided with a mandrel; a transfer roller provided with a blanket that transfers ink to the outer cylinder surface of the cylindrical container at an equal rotation peripheral speed; and a plurality of transfer rollers that transfer ink to the blanket. , a multicolor printing device for a cylindrical container, comprising: a rotation driving means for rotationally driving the mandrel cylinder, a mandrel, a transfer roller, and a transfer roller; A synchronizing gear that meshes with the roller rotation shaft at least in the transfer section is provided.

(Function) Therefore, in the multicolor printing apparatus for cylindrical containers of the present invention, as described above, the mandrel rotation shaft that rotates the mandrel and the roller rotation shaft that rotates the transfer roller are synchronized so that they mesh with each other at least in the transfer section. By providing a gear, each mandrel is always regulated in its rotation in the transfer section by one transfer roller-side tuning gear, and the rotational state of the mandrel within the transfer section can be controlled except for machining errors of the mandrel-side tuning gear. , can be exactly the same.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In describing this embodiment, we will take as an example a multicolor printing device that prints on the body of a two-piece can (an example of a cylindrical container) used for containers such as beverages.

First, regarding the first embodiment device shown in FIGS. 1 to 5,
Its structure and operation will be explained.

The multicolor printing apparatus A of the first embodiment is of a type in which a mandrel cylinder is driven intermittently, and as shown in FIG. Transfer roller 4, upper transfer roller 5
, 6, lower transfer roller 7.8. Finishing varnish application roll 9
, the main configuration is a transfer unit IO.

The can body supplying means 1 is a can body T having a cylindrical shape with a bottom.
It is a means for feeding the mandrel cylinder 2 to the mandrel cylinder 2 and sequentially attaching it to the mandrel 11 of the mandrel cylinder 2, and is provided with a feeder 12 and a mounting mechanism (not shown) for attaching it to the mandrel 11.

The mandrel cylinder 2 is used to intermittently rotate and transport the circumferentially supported can body T in order to print and varnish the outer circumferential surface of the can body T. A plurality of mandrels 11 supporting the can body T are arranged in a row in the section.

The mandrels 11 are parallel to the cylinder axis 13 of the mandrel cylinder 2 and are provided in a protruding manner at equally spaced positions on the same circumference.

The upper transfer roller 3 and the lower transfer roller 4 are the can 1f.
This is for transferring multicolor ink C onto the outer peripheral surface of the i4T, and planchers 1-14 and 15 are wound and fixed on the outer peripheral surfaces of the retransfer rollers 3 and 4.

The upper transfer rollers 5, 6 and the lower transfer roller 7.8 are provided with a plate on the outer periphery for applying desired printing, and the plancher (1)
4.15 are rollers that transfer a predetermined ink C according to the pattern of the plate, and in the embodiment, upper transfer rollers 5 and 6 that transfer the first color ink C1 and the second color ink C2 to the blanket 14; A lower transfer roller 7.8 is provided for transferring the color ink C3 and the fourth color ink C4 onto the blanket 15.

Incidentally, the double diameter rollers 5, 6, 7.8 are provided with a kneading roll group 16.8 for kneading the inks CI, C2, C3, C4, respectively.
17, 18, and 19 are provided.

The finishing varnish application roll 9 has a can body T printed in multiple colors.
This finishing varnish application roll 9 is provided with a pair of kneading rolls 20 and 21.

The transfer unit IO is a device that removes the can body T after multicolor printing and varnishing from the mandrel 2, attaches it to the transfer chino 24 hooked to the sprockets 22 and 23, and transfers it to the next dryer. be.

Next, the rotational drive means B of the apparatus of the first embodiment will be described.

As shown in FIG. 1, this rotation driving means B uses one motor 25 as a driving source to drive the mandrel cylinder 2,
Mandrel 11, transfer roller 3゜4, transfer rollers 5, 6
. A mandrel-side tuning gear 27 and a transfer roller-side tuning gear 28 that mesh with each other at least in the transfer section are provided.

First, the intermittent rotation drive system of the mandrel cylinder 2 is driven by a motor 25. first pulley 29, first timing belt 30,
It is composed of a second pulley 31, a first intermediate shaft 32, a third pulley 33, a second timing belt 34, a fourth pulley 35, a bevel gear 36, 37, a rotation input shaft 38, an intermittent rotation device 39, and a cylinder shaft 40. - The cylinder shaft 40 is connected to the second gear 102. By using bearings for the seventh gear 107 and the eighth gear lO8, the drive systems are made unrelated.

The rotational drive system of the mandrel 11 includes a motor 25, a first pulley 29, a first timing belt 30, a second pulley 31 .
First intermediate shaft 32, first gear 101, second gear 102, third gear 103, second intermediate shaft 41, fourth gear 104, fifth gear
It is composed of a gear 105, a third intermediate shaft 42, a sixth gear 106, a seventh gear 107, an eighth gear 108, a ninth gear 109, and a mandrel rotating shaft 13.

Note that the first gear 101 and the second gear 102 are a gear set that mesh with each other, and the seventh gear 107 and the eighth gear 1
08 and are formed to rotate together by a connecting member 43.

The rotational drive system of the transfer rollers 3 and 4 includes the seventh gear 107.
The 10th gear 110, the 4th intermediate shaft 44, the 11th gear 1ii, the 12th gear 112. It is constituted by a transfer roller rotation shaft 26.

The rotational drive system of the transfer rollers 5, 6, 7.8 is
It is derived from the gear 112, and the 13th gear 113,
It is constituted by a transfer roller rotation shaft 45.

A powder brake 49 is provided on the transfer roller rotation shaft 45 via pulleys 46, 47 and a belt 48.
By applying a brake torque to the 13th gear 113, the meshing tooth surface (tooth contact) with the 12th gear 112 is prevented from changing due to fluctuations in the transmitted drive torque, and image doubleness due to backlash is eliminated.

Next, the mandrel rotating shaft 13 and the transfer roller rotating shaft 2
The retuning gears 27 and 28 provided at 6 and 6 will be explained with reference to FIGS. 3 and 4.

The mandrel side tuning gear 27 is provided on each mandrel 11 and is a gear with a predetermined number of teeth, and the processing accuracy of each tuning gear 27 is high and the accuracy is made uniform.

As shown in FIG. 4, the transfer roller side synchronizing gear 28 has gears formed on approximately half the circumference, and has a meshing preparation gear portion 28a, a meshing gear portion 28b, and a non-meshing portion 28c.

The meshing preparation gear portion 28a is formed to smoothly start meshing with the mandrel-side tuning gear 27, and the tooth thickness and tooth height are gradually increased toward the meshing gear portion 28b.

Further, the meshing gear portion 28b is a portion that meshes with the mandrel side tuning gear 27 to regulate the rotation of the mandrel rotating shaft 13 by the transfer rollers 3 and 4 in the transfer section by the transfer roller 3°4. 2.2 rotations of the mandrel side tuning gear 27 (2 rotations are the transfer section)
Only the gear teeth are formed.

Further, the non-meshing portion 28c is provided to release the gear mesh during the rotational transfer process of the can body T.

Here, in the embodiment, the re-tuning gears 27 and 28 are provided separately from the rotation drive means B, so that the ninth gear 109 is provided at the same axis position as one of the mandrel-side tuning gears 27. The ninth gear 109 is the mandrel rotating shaft 1
At the same time, the retuning gears 27 and 28 take the role of timing so that the retuning gears 27 and 28 mesh smoothly.

Next, the operation of the first embodiment will be explained.

First, the transfer process for the can body T and the rotation transfer process of the can body T will be described.

(B) Transfer process At the start of transfer, as shown in Figure 2, the upper transfer roller 3
, the first color ink Ct (
The transfer section St) is transferred, and the second color ink C2 (transfer section 32) is transferred from the upper transfer roller 6.

In this state, while the can body T makes one rotation (first rotation)
, the upper transfer roller 3 rotates 115 times to transfer the first color ink C1 onto the outer peripheral surface of the can body T, and roughly the can body T transfers the next color ink C1 to the outer peripheral surface of the can body T.
During the rotation (second rotation), the upper transfer roller 3 further rotates 115 times to transfer the second color ink C2 onto the outer peripheral surface of the can [IT].

Note that during this transfer, the mandrel cylinder 2 is stationary and only the mandrel 11 is rotating, and the peripheral speeds of the can body T, upper transfer roller 3, and upper transfer rollers 5 and 6 are such that slipping occurs. To prevent this, the circumferential speeds are made equal.

Also, at the position of the lower transfer roller 4, the third color ink C3 and the fourth color ink C4 are transferred in the same manner as described above.

23 while the mandrel cylinder 2 is stationary.
72 rotations, but 1/2 of the 2 rotations used for transfer
The rotation is used as a time to damp mechanical vibrations at the moment when the mandrel cylinder 2, which transfers the can body T to the transfer process, stops.

(b) Rotary transfer process After the transfer, the can body T continues to rotate as it is, and while it performs another 2y2 rotation, it transfers one pitch of the rotation transfer section P.
Proceed.

While the can barrel T is being rotated and transferred, the upper transfer roller 3 rotates by 1/2, and the upper transfer rollers 5 and 6 rotate by 1 rotation, resulting in the transfer start state shown in FIG. 2.

In this way, by repeating the transfer process and the rotational transfer process, multicolor printing on the can body T is performed.

Next, the operation of the rotational drive system will be described.

First, in the transfer process, the mandrel cylinder 2 supporting the mandrel rotation shaft 13 does not rotate (hereinafter referred to as revolution), and only the mandrel rotation shaft 13 rotates (hereinafter referred to as rotation). , as shown in FIG. 5, both the tuning gears 27 and 28 move from the regular meshing start point P1 of the transfer roller side tuning gear 28 to the meshing end point P2.
2.2 (rotation section of 28b), including two rotations of the mandrel side tuning gear 27, which is the transfer section.
A regular interlocking rotation of rotation is performed.

Then, in the rotation section of the non-meshing portion 28c of the transfer roller side tuning gear 28, the mandrel side tuning gear 27 rotates and revolves (rotation transfer of one pitch).

In other words, each mandrel 11 is always subject to rotation regulation in the transfer section by one transfer roller side tuning gear 28, and the rotational state of the mandrel 11 within the transfer section is as follows, excluding the machining error of the mandrel side tuning gear 27. become exactly the same.

Therefore, the relative rotational error between the can body T and the transfer rollers 3 and 4 is only the pitch error due to the machining accuracy of the mandrel side tuning gear 27, and if the machining accuracy of the mandrel side tuning gear 27 is increased and equalization is achieved, It is possible to make the line deviation very small.

Incidentally, a test example conducted by the present inventor will be described below.

(Test specifications) Gear type; Helical gear module; 2.5 Mandrel side tuning gear, 20T (number of teeth) Transfer roller side tuning gear, 50T (number of teeth for 172 rotations including the transfer area of the transfer roller) Printing speed; 250 m/win (MAX) printing
Plate: Screen line number #120 to #150 (test results) As a result of performing according to the above specifications, the printing speed was 250 m/w
In (M A

Next, a second embodiment shown in FIG. 6 will be described.

The multicolor printing apparatus A' of the second embodiment is of a type that continuously rotates a mandrel cylinder, so that the rotation locus M of the can barrel T can be transferred while rotating and revolving at the same time. At the position of the transfer roller 3.4, the trajectory is partially corrected so as to follow the surfaces of the transfer rollers 3, 4.

Although illustration of the driving means is omitted, it goes without saying that the mandrel-side tuning gear 27 and the transfer roller-side tuning gear 28 can be applied to this second embodiment as well, as in the first embodiment.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, in the embodiment, a gear train is used as the one-rotation driving means, but other driving means may be used.

Further, in the case of using a gear train as the rotation drive means as in the embodiment, a gear provided on the mandrel rotating shaft may be used as the mandrel side tuning gear, and only a rotating roller side tuning gear may be added.

(Effects of the Invention) As described above, in the multicolor printing apparatus of the present invention, the mandrel rotation shaft that rotates the mandrel and the transfer roller rotation shaft that rotates the transfer roller are engaged with each other at least in the transfer section. Since the structure is equipped with a synchronizing gear, the rotation can be always regulated by the same synchronizing gear on the transfer roller side at least in the transfer section, and the relative rotational error between the cylindrical container and the transfer roller can be extremely reduced. can get.

Due to this effect, it is possible to prevent line misalignment in multicolor printing by reverse transfer, and it is possible to perform multicolor printing of precise designs at high printing speed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the driving means of a multicolor printing device according to the first embodiment of the present invention, FIG. 2 is an overall front view showing the device according to the first embodiment, and FIG. 3 is a synchronization gear of the device according to the first embodiment. FIG. 4 is a front view showing the tuning gear of the device of the first embodiment, FIG. 5 is an explanatory diagram of the operation of the tuning gear of the device of the first embodiment, and FIG. 6 shows the device of the second embodiment. It is an explanatory diagram. B... Rotation drive means T... Can ff4 (cylindrical container) 2... Mandrel cylinder 3.4... Transfer rollers 5.6, 7.8... Transfer roller 11... Mandrel 13 ... Mandrel rotating shaft 14, 15... Blanket 26... Transfer roller rotating shaft 27... Mandrel side tuning gear 28... Transfer roller side tuning gear Patent application: Yamato Seikan Co., Ltd. Shinnihon Co., Ltd. Koki Co., Ltd.

Claims (1)

[Claims] 1) A mandrel cylinder provided with a plurality of mandrels that supports a cylindrical container, and a blanket that transfers ink to the outer cylinder surface of the cylindrical container at an equal circumferential speed of rotation. A multicolor printing device for a cylindrical container, comprising a transfer roller, a plurality of transfer rollers that transfer ink to the blanket, and a rotational drive means that rotationally drives the mandrel cylinder, the mandrel, the transfer roller, and the transfer roller, A multicolor printing apparatus for a cylindrical container, characterized in that a mandrel rotation shaft for rotating the mandrel and a transfer roller rotation shaft for rotating the transfer roller are provided with synchronized gears that mesh with each other at least in a transfer section.